Work and Energy - Multiple Choice Test

Question 1
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Question: Work done = Force x _______
1. distance
2. acceleration
3. velocity
4. speed

Answer: 1
Question 2
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Question: 1 joule = 1 _______
1. N m2
2.
3. N m
4. N2 m2

Answer: 3
Question 3
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Question: Which form of energy does the flowing water possess?
1. gravitational energy
2. potential energy
3. electrical energy
4. kinetic energy

Answer: 4
Question 4
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Question: A body of mass 2 kg is dropped from a height of 1m. Its
kinetic energy as it touches the ground is _______
1. 19.6 N
2. 19.6 J
3. 19.6 kg
4. 19.6 m

Answer: 2
Question 5
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Question: The unit of power is _______
1. watt per second
2. joule
3. kilojoule
4. joule per second

Answer: 4
Question 6
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Question: 3730 watts = ______h.p.
1. 5
2. 2
3. 746
4. 6

Answer: 1
Question 7
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Question: A coolie carries a load of 500 N to a distance of 100 m.
The work done by him is
1. 5 N
2. 50,000 Nm
3. 0
4. 1/5 N

Answer: 3
Question 8
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Question: The P.E. of a body at a certain height is 200 J. The
kinetic energy possessed by it when it just touches the surface of the
earth is
1. > P.E.
2. < P.E.
3. = P.E.
4. cannot be known

Answer: 1
Question 9
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Question: Power is a measure of the _______
1. rate of change of momentum
2. force which produces motion
3. change of energy
4. rate of change of energy

Answer: 4
Question 10
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Question: Two objects of masses 1 x 10-3 kg and 4 x 10-3 kg have
equal momentum. What is the ratio of their kinetic energies?
1. 4:1
2. 2:1
3. 16:1
4.

Answer: 1
Question 11
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Question: A 40 newton object is released from a height of 10 m. Just
before it hits the ground, its kinetic energy, in joules is _______
1. 400
2. 3920
3. 2800
4. 4000

Answer: 1
Question 12
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Question: If the speed of an object is doubled then its kinetic
energy is _______
1. doubled
2. quadrupled
3. halved
4. tripled

Answer: 2
Question 13
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Question: 1.5 kW = ______ watts
1. 1500
2. 150
3. 15000
4. 15

Answer: 1
Question 14
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Question: A man of mass 50 kg jumps to a height of 1 m. His
potential energy at the highest point is (g = 10 m/s2)
1. 50 J
2. 60 J
3. 500 J
4. 600 J

Answer: 3
Question 15
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Question: The type of energy possessed by a simple pendulum, when it
is at the mean position is
1. kinetic energy
2. potential energy
3. potential energy + kinetic energy
4. sound energy

Answer: 1
Question 16
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Question: An iron sphere of mass 30 kg has the same diameter as an
aluminium sphere whose mass is 10.5 kg. The spheres are dropped
simultaneously from a cliff. When they are 10 m from the ground, they
have the same _______.
1. acceleration
2. momentum
3. potential energy
4. kinetic energy

Answer: 1
Question 17
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Question: A 1 kg mass has a kinetic energy of 1 joule when its speed is
1. 0.45 m/s
2. 1 m/s
3. 1.4 m/s
4. 4.4 m/s

Answer: 3
Question 18
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Question: If air resistance is negligible, the sum total of
potential and kinetic energies of a freely falling body _______
1. increases
2. decreases
3. becomes zero
4. remains the same

Answer: 4
Question 19
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Question: Name the physical quantity which is equal to the product
of force and velocity.
1. work
2. energy
3. power
4. acceleration

Answer: 3
Question 20
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Question: An object of mass 1 kg has potential energy of 1 joule
relative to the ground when it is at a height of _______.
1. 0.102 m
2. 1 m
3. 9.8 m
4. 32 m

Answer: 1